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If you would still be interested in selling the 4" gauge for $15 - I would like it for my whip set up. Is that what you were using it for? Is it clean as far as you know - suitable for partial pressure mixing?
If you're interested in selling just the 4" gauge for $15.00 still, I would be interested in it for my whip. Is it O2 clean and/or suitable for partial pressure mixing?